RU2531221C2 - Impact tool - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to impact tools. The tool contains a handle, exterior body, electric motor, gear wheel, impact forming assembly, impact element, torque transmission element and power transmission gear wheel. The electric motor is installed on the exterior body, and the axis of its rotation passes towards transverse direction with reference to an axis of the working element of the tool. The gear wheel is designed with a possibility to be driven by an electric motor. The impact forming assembly is designed with a possibility of actuating by the gear wheel. The impact element is designed with a possibility of actuating by the impact forming assembly and ensures the translational movement of the working element of the tool. The torque transmission element is located on the side of the exterior body and rotates around the axis of the working element of the tool effected by a torque of the electric motor. The gear wheel of transmission of power is gyrated together with an element of transmission of a torque and transmits a torque to a gear wheel. The power transmission gear wheel is designed with a possibility of movement together with the impact forming assembly towards axial direction of the working element of the tool with reference to the torque transmission element at simultaneous engaging the gear wheel. The exterior body is connected to the impact forming assembly and gear wheel via the elastic element and is designed with a possibility of movement towards axial direction of the working element of the tool with reference to the impact forming assembly and gear wheel.

EFFECT: vibration of impact tool handle is decreased.

6 cl, 10 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to a vibration protection technology for a percussion instrument, when the working element is forced to perform a predetermined chiselling operation due to the translational movement of this element in the axial direction.

BACKGROUND

Japanese Patent Laid-Open Publication No. 2003-39344 describes an electric breaker having a housing structure providing vibration protection. In the known electric jackhammer, a housing with a vertical engine arrangement forms the outer shell of the electric jackhammer and is made integrally with the handle held by the user, and this housing is connected through an elastic element to the block of the percussion mechanism, which provides impact of the working element of the jackhammer.

In this electric jackhammer, the transmission of vibration from the percussion unit to the handle can be reduced with an elastic element, but further improvement is required to effectively protect the handle from vibration.

SUMMARY OF THE INVENTION

OBJECT OF THE INVENTION

Thus, an object of the present invention is to further protect the handle of a percussion instrument from vibration.

MEANS OF SOLVING THE PROBLEM

In order to solve the above problem, in accordance with a preferred embodiment of the present invention, there is provided a percussion instrument with a working element, which is forced to translate in its axial direction and, thus, perform a given operation. By “impact tool” in the present invention is meant a jackhammer in which the working element is forced to perform translational movement in the axial direction, and a hammer drill in which the working element is forced to perform translational movement in the axial direction and rotation around the same axis.

The percussion instrument of the present invention is characterized in that it includes a handle held by the user, an external housing made integrally with the handle, an electric motor mounted in the external housing such that its axis of rotation extends laterally with respect to the axis of the working element tool, gear wheel, driven by the torque of the electric motor and located in the outer casing, a shock generating unit, driven by the gear wheel and p memory location in the outer housing and the striking element actuated pin assembly creating and providing the translational movement of the tool element. In addition, the electric motor is mounted on the outer casing, and the outer casing is connected to the impact generating unit and the gear via an elastic element and is arranged to move in the axial direction of the tool working element relative to the impact generating unit and the gear.

According to this invention, the outer casing, made as a unit with the handle, is connected through an elastic element with a shock generating unit and a gear wheel, which are sources of vibration, so that it can move in the axial direction of the tool working element relative to the shock creating unit and the gear wheel , and the electric motor is attached to the outer casing. With this design, in which the electric motor is a mass attached to the outer casing, the mass of the handle, made as a unit with the outer casing, can be made relatively large compared to the shock creating unit, which improves the protection of the handle from vibration. In particular, in the present invention, the outer case is connected through an elastic element in such a way that it can move relative to the impact generating unit and the gear in the axial direction of the tool working element. With this design, the relative position of the impact generating unit and the gear, which drives the impact generating unit, remains unchanged, which allows for a stable and smooth movement.

According to a further embodiment of the percussion instrument of the present invention, the electric motor is fixedly mounted in the outer casing and is made integrally with the handle. With this design, the integration of the electric motor and the handle can be further increased.

According to another embodiment of the impact tool of the present invention, this tool includes a torque transmission element that is mounted on the side of the outer casing and rotates around the axis of the tool’s working element under the influence of engine torque, and a power transmission gear that rotates with the element transmitting torque and transmitting torque to the gear. In addition, the gear wheel power transmission is arranged to move together with the site of the creation of impact in the axial direction of the working element of the tool relative to the transmission element of torque, while being in engagement with the gear. The "torque transmission element" in the present invention typically comprises a cylindrical element, preferably having an opening, such as a groove or slot, on its circumferential surface.

With this design, which is proposed by the present invention, when the impact generating unit and the outer case are moved in the axial direction of the tool working element relative to each other due to the vibration that occurred when the impact generating unit and the impact element are actuated, the torque transmission element and the gear power transmissions are respectively moved relative to each other. Thus, the torque can be stably transmitted from the electric motor to the gear via the torque transmission member and the power transmission gear.

According to yet another embodiment of the impact tool of the present invention, the tool further includes a gear wheel for driving the tool member, which causes the tool to rotate in a circumferential direction under the action of a motor torque. In addition, the power transmission gear is rotated by a gear to drive the operating member through the torque transmission member. According to this invention, with such a design, the impact generating unit can be driven by the power received from the rotation chain of the working element of the tool.

According to a further embodiment of the percussion instrument of the present invention, the end part of the electric motor, distant with respect to the axis of the working element of the tool in the direction along the axis of rotation of the electric motor, is attached to the outer casing so that the electric motor can rotate in the direction along the axis of the working element of the tool.

According to this invention, by installing the motor on the outer housing with the possibility of rotation, the electric motor can be used as a massive part of the handle, which allows to reduce the degree of vibration transmission from the shock generating unit, which is the source of vibration, to the handle. With this design, when the outer casing and the impact generating unit move relative to each other in the axial direction of the tool working element due to vibration, the impact tool can respond to such movement while improving the protection of the handle from vibration occurring in the impact creating unit.

According to another embodiment of the impact tool of the present invention, in a structure in which the end part of the electric motor is rotatably mounted on the outer casing, the output shaft of the electric motor is divided in the axial direction of the shaft, and the parts of the divided shaft are articulated by a universal joint. The term "universal joint" in this invention refers to a joint that does not affect the transmission of torque, even when changing the relative position of the two parts of the divided shaft and the angle between them. With this design, when the electric motor and the impact generating unit move relative to each other in the axial direction of the tool working element due to vibration, the impact tool can smoothly transmit the motor torque to the impact generating unit through the gear, while reacting to such relative movement.

According to a further embodiment of the impact tool of the present invention, the tool has a dust cover that closes at least the universal joint.

Effect of the Invention

According to the present invention, a technology is proposed to further reduce the vibration of the handle while ensuring steady movement in the percussion instrument.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view showing the complete construction of a rotary hammer, the housing structure of which provides vibration protection in accordance with a first embodiment of the present invention.

Figure 2 is another cross-sectional view showing the complete design of the hammer in the state of deformation of a helical spring operating in compression.

Figure 3 is a sectional view on an enlarged scale illustrating the design of the punch body, providing protection against vibration.

FIG. 4 is a sectional view showing the complete construction of a rotary hammer, the housing structure of which provides vibration protection, according to a second embodiment of the present invention.

Figure 5 is another sectional view showing the complete construction of the hammer in the state when the drive motor is rotated (tilted).

Fig.6 is a view in section in section along the line aa shown in Fig.4.

Fig.7 is a view in section in section along the line bb shown in Fig.4.

Fig. 8 is a sectional view in cross section along the line CC shown in Fig. 4.

Fig.9 is a view in section in section along the line D-D shown in Fig.4.

Figure 10 is a sectional view in section along the line EE shown in figure 4.

Exemplary Embodiments of the Invention

The first embodiment of the invention

Now, with reference to FIGS. 1-3, a first embodiment of the present invention will be described. In this embodiment, an electric hammer drill is considered as a typical example of a percussion instrument. As shown in FIGS. 1 and 2, the hammer drill 101 corresponding to this embodiment of the present invention includes, as main components, an external housing 103 forming the outer shell of the hammer drill 101, a drill punch member 119 removably mounted in the front end portion (in FIG. .1 - on the left) of the outer casing 103 using the holder 137, and a handle 109 for holding by the user and connected to the outer casing 103 from the side opposite to the working element 119. The working element 119 of the punch Mounting by a hollow tool holder 137 such that it is able to translationally move relative to this holder in an axial direction. The outer casing 103, the punch working element 119 and the handle 109 are components that correspond to the “outer casing”, “working element” and “handle” in the terminology of the present invention. In this embodiment of the present invention, for convenience of consideration, the side of the working element 119 of the punch is considered to be the front, and the side of the handle 109 is considered to be back.

In the outer housing 103, a drive motor 111, a housing 105 of a crank mechanism including a cup 106, and a gear housing 107 are located. The housing 105 of the crank mechanism, including the cup 106, and the gear housing 107 form an inner housing 103. In the housing 105 of the crank mechanism there are a movement conversion mechanism 113 and an impact mechanism 115 that provide translational movement of the punch working element 119 in its axial direction. A power transmission mechanism 117 is located in the gear housing 107, which rotates the rotary hammer element 119 around its axis. The motion conversion mechanism 113, the percussion mechanism 115, and the power transmission mechanism 117 form an internal actuator for driving the punch tool 119. The drive motor 111 is mounted in the lower part of the outer casing 103 so that its axis of rotation extends in a vertical direction (vertically in FIG. 1) substantially perpendicular to the longitudinal direction of the outer casing 103 (axial direction of the operating member 119). The handle 109 is integral with the outer housing 103, whereby the drive motor 111 is substantially integral with the handle 109.

The power transfer mechanism 117 appropriately reduces the rotational speed of the drive motor 111 and transfers the torque to the motion conversion mechanism 113, and the movement conversion mechanism 113 appropriately converts the torque of the drive motor 111 into translational movement and then drives the impact mechanism 115. As a result, the axial direction (horizontal direction in figure 1) of the working element 119 of the punch using the percussion mechanism 115 create an impact force. The motion converting mechanism 113 is a component that corresponds to the “impact generating unit” in the terminology of the present invention. In addition, the power transmission mechanism 117 appropriately reduces the rotation speed of the drive motor 111 and transmits torque to the rotary hammer element 119 through the cylinder 131 and the holder 137, which causes the rotary hammer element 119 to rotate in its circumferential direction. The drive motor 111 is turned on when the user presses the switch 109a located on the handle 109.

As shown in FIG. 3, the motion conversion mechanism 113, as the main components, includes a crank shaft 121, which is rotationally driven in the horizontal plane by a power transmission mechanism 117 for transmitting torque of the drive motor 111, a crank disk 123, which is driven in rotation together with the crank shaft 121, a connecting rod 127, which is loosely connected to the crank disk 123 by means of a stud 125, and a drive element in the form of a piston 129, which is attached to the connecting rod 127 by means of a pin 128. The piston 129 is slidably mounted inside the cylinder 131. When the drive motor 111 is turned on, the piston 129 begins to translate in the axial direction of the operating member 119 inside the cylinder 131.

The impact mechanism 115, as the main components, includes a shock element in the form of a striker 133, which is slidably mounted in the bore of the cylinder 131, and an intermediate element in the form of an adapter 135, which is slidably mounted in the holder 137 and serves to transfer the kinetic energy of the striker 133 work element 119 punch. Between the piston 129 and the striker 133, an air chamber 131a is created in the cylinder 131. The firing pin 133 is driven by pressure fluctuations (air spring principle) in the air chamber 131a during sliding movement of the piston 129. As a result, the firing pin 133 collides with an adapter 135 (strikes against it), which is slidably mounted in the holder 137. As a result, the impact force that occurred during a collision is transmitted to the working element 119 of the punch through the adapter 135.

The power transmission mechanism 117, as the main elements, includes a drive gear 141, a torque limiter 143, an intermediate shaft 145, a first bevel gear 147, a second bevel gear 149, a rotating sleeve 151, a third bevel gear 153 and a fourth bevel gear wheel 155. The first bevel gear 147, the second bevel gear 149, the rotating sleeve 151, the third bevel gear 153 and the fourth bevel gear 155 of the power transmission mechanism 117 are installed claimed within the housing 105 of the crank mechanism, and the other elements of the mechanism 117 mounted within the housing 107 of the gearbox.

The torque of the drive motor 111 is transmitted from the drive gear 141 created on the output shaft 112 of the drive motor 111 to the intermediate shaft 145 through the torque limiter 143. A torque limiter 143 is mounted on the countershaft 145 as a safety device that interrupts the power transmission from the drive gear 141 to the countershaft 145 when an excess load occurs on the punching member 119 in excess of a value predetermined by the spring 143a of the torque limiter 143 . After that, the torque transmitted to the intermediate shaft 145 is transmitted from the first bevel gear 147, which rotates together with the intermediate shaft 145 in a horizontal plane, to the second bevel gear 149, which rotates in a vertical plane in engagement with the first bevel gear 147 , and then further transmitted from the second bevel gear 149 to the rotating sleeve 151.

The rotary sleeve 151 is a cylindrical element that is located on the outer side of the cylinder 131 coaxially with it and is arranged to move in the longitudinal direction relative to this cylinder 131, the second bevel gear 149 mounted on the outer side of the front end of the rotary sleeve 151, and the third bevel a gear wheel 153 mounted on the outer side of the rear end portion of the rotary sleeve 151. The second bevel gear 149 is longitudinally seated on the slot rotating the sleeve 151 in its front end portion, and the third bevel gear 153 in the longitudinal direction of the slots are planted on the rotating sleeve 151 in its rear end portion. Thus, when the drive motor 111 is turned on, these three elements, namely the second bevel gear 149, the rotating sleeve 151 and the third bevel gear 153, begin to rotate together.

The third bevel gear 153 is engaged with the fourth bevel gear 155 mounted on the crank shaft 121. Thus, the torque of the rotary sleeve 151 is transmitted from the third bevel gear 153, which rotates in a vertical plane with the rotary sleeve 151, to the crank shaft 121 through the fourth bevel gear 155, as a result of which the crank shaft 121 rotates in a horizontal plane. This makes it possible to actuate the motion conversion mechanism 113 and the impact mechanism 115. The rotary sleeve 151 and the fourth bevel gear 155 are components that correspond to a “torque transmission member” and a “gear” in the terminology of the present invention. The third bevel gear 153 is rotatably mounted on a sliding bearing 169, which is located in the bearing housing 163, and the crank shaft 121 is rotatably mounted on the rolling bearing 167, which is located in the bearing housing 163.

Further, clutch teeth 151a are created on the inner circumferential surface of the rotary sleeve 151, which are engaged with the clutch teeth 131b created on the outer circumferential surface of the cylinder 131. Thus, the torque of the rotary sleeve 151 is transmitted to the cylinder 131 by means of the clutch teeth 151a, 131b, and then - to the working element 119 of the punch through the holder 137, which is connected to the cylinder 131 by means of a connecting pin 132, which brings the working element 119 of the punch into rotation.

On the upper surface of the housing 105 of the crank mechanism, there is an operating mode change element in the form of a rotary operating mode switch 175, which the user can manually activate. The rotary switch 175 of the operating mode provides a transition between the jackhammer mode, in which the working element 119 of the puncher begins to perform at least a chiselling operation only due to movement with impact, and the punch mode, in which the working element 119 of the puncher begins to perform the drilling operation with impact displacement with kick and rotation. When switching the rotary switch 175 of the operating mode, the rotary sleeve 151 slides in the axial direction of the working element 119 of the punch. The rotary switch 175 operating mode is mounted for rotation around a vertical axis transverse to the axis of the working element 119 of the punch. The rotary mode switch 175 has an eccentric 175a that interfaces with a circumferential circumferential groove 151b created on the outer surface of the rotary sleeve 151. When the user rotates the rotary mode switch 175, the rotary sleeve 151 is shifted along the cylinder 131 in the axial direction of the working element 119 under the action of the eccentric 175a.

When the rotary mode switch rotary switch 175 is set to the punch mode, the rotary sleeve 151 is pushed back (in the direction of the handle 109) and the clutch teeth 151a on the rotary sleeve 151 are engaged with the clutch teeth 131b on the cylinder 131, whereby torque is transmitted to the cylinder 131. Thus, in this case, the movement converting mechanism 113 and the percussion mechanism 115 are actuated, and the torque of the rotary sleeve 151 is transmitted to the cylinder 131 and then transmitted to the working element 119 of the punch through the holder 137, which is connected inen with a cylinder 131 by a connecting pin 132. This causes a displacement with impact and rotation of the working element 119 of the punch.

When the rotary switch 175 of the operating mode is set to the jackhammer mode, the rotary sleeve 151 is pushed forward (in the direction of the punch working member 119) and the clutch teeth 151a on the rotary sleeve 151 are disengaged from the clutch teeth 131b on the cylinder 131, resulting in a torque it is no longer transmitted to the cylinder 131. Thus, in this case, under the action of the movement conversion mechanism 113 and the percussion mechanism 115, the working element 119 only moves with impact. Therefore, according to this embodiment of the present invention, the rotary sleeve 151 not only serves to transmit (distribute) the torque of the drive motor 111, which is a source of rotational energy, both to the movement conversion mechanism 113 and to the punch working element 119, but also serves as a coupling an element for changing the operating mode.

A holder 137 is mounted in front of the housing 105 of the crank mechanism so that it can move in the axial direction of the punch member 119 and rotate in a circumferential direction relative to the housing 105 of the crank mechanism in the front sliding bearing 161. A bearing casing 163 located at the rear of the housing 105 of the crank mechanism is mounted so that it can move axially relative to this housing 105 in the rear plain bearing 165. Between the rear end surface of the bearing casing 163 and the front surface of the rear end part of the housing 105 of the crank mechanism along the axis of the working element, a compression spring 171 is installed as an elastic coupling element, which compresses and stretches in the axial direction of the said working element. A compression spring 171 is a component that corresponds to an “elastic element” in the terminology of the present invention. Compression coil spring 171 creates a displacement force causing the bearing housing 163 to be pushed forward. This moving force is perceived by the rubber ring 173, which is installed between the rear flange 137a of the holder 137 and the inner flange 106a of the cup 106.

More specifically, in this embodiment of the present invention, not only the holder 137, the cylinder 131, the movement conversion mechanism 113 and the impact mechanism 115, but also the third and fourth bevel gears 153 and 155 of the power transmission mechanism 117, which is supported by the bearing casing 163, installed in the housing 105 of the crank mechanism in such a way that they can move in the axial direction of the working element 119 of the punch under the action of a helical spring 171, operating in compression. The housing 105 of the crank mechanism is made integrally with the external housing 103. Therefore, the external housing 103, made integrally with the handle 109, is connected with the movement conversion mechanism 113 and the impact mechanism 115 (which will also be referred to here as the impact mechanism assembly, including a motion conversion mechanism 113 and a percussion mechanism 115), which are sources of vibration, through an elastic coil spring 171 operating in compression.

In the hammer drill 101 having the construction described above, when the user holds the handle 109 and presses the switch 109a to turn on the drive motor 111, while simultaneously exerting pressure on the outer housing 103 in the axial direction of the drill punch element 119 and pressing this element against the workpiece, the drive torque the electric motor 111 is transmitted from the rotating sleeve 151 of the power transmission mechanism 117 to the movement conversion mechanism 113 through the third and fourth bevel gears 153, 155. As a result At that time, the operation of the movement conversion mechanism 113 causes the piston 129 to slide in the cylinder 131. This sliding causes the firing pin 133 to move progressively inside the cylinder 131 under the influence of air pressure fluctuations or under the influence of an “air spring” in the air chamber 131a of the cylinder 131. As a result, the firing pin 133 collides with an adapter 135, which leads to the transfer of kinetic energy created in such a collision into the working element 119 of the perforator.

In this case, when the rotary switch 175 of the operation mode is set to the jackhammer mode, the rotary sleeve 151 is pushed forward, and the clutch teeth 151a on the rotary sleeve 151 are disengaged from the clutch teeth 131b on the cylinder 131, as a result of which the torque is no longer transmitted to the cylinder 131. Therefore, the working element 119 of the puncher performs the chiselling operation only due to movement with impact in its axial direction.

On the other hand, when the rotary switch 175 of the operation mode is set to the punch mode, the rotary sleeve 151 is shifted backward and the clutch teeth 151a on the rotary sleeve 151 are engaged with the clutch teeths 131b on the cylinder 131, resulting in a torque of the drive motor 111 through the rotary sleeve 151 is transmitted to the cylinder 131. Therefore, the cylinder 131 and the holder 137 are rotated in a vertical plane, and the working element 119 of the punch starts to rotate together with the holder 137. As a result, the working element 119 of the punch Performs a drilling operation with impact (drilling operation) of the workpiece (concrete) by moving with impact in the axial direction and rotating in the circumferential direction.

During chiselling or hammer drilling in the node of the percussion mechanism (movement conversion mechanism 113 and percussion mechanism 115), pulsed and cyclic vibrations occur in the axial direction of the perforating tool 119. With such a vibration, the compression screw spring 171 elastically deforms, resulting in movement of the motion conversion mechanism 113 connected through the spring in the axial direction of the perforator working element 119 relative to the crank mechanism housing 105. Thus, it is possible to reduce the transmission of vibration from the movement converting mechanism 113 to the crank mechanism housing 105. Figure 2 shows the state when the helical spring 171, working in compression, is deformed. As a result, the outer casing 103, to which the casing 105 of the crank mechanism is attached, and the handle 109, made integrally with the outer casing 103, are protected from vibration.

Moreover, in this embodiment of the present invention, the drive motor 111 is attached to the outer casing 103. With this design, when the drive electric motor 111, as a component of a large mass, is attached to the outer casing 103, it is possible to make the mass of the handle 109, made as a whole with the external the housing 103, relatively large compared to the movement conversion mechanism 113 and the percussion mechanism 115, which causes the perforating tool 119 to move with impact, thereby improving protection Handles 109 from vibration.

In addition, in this embodiment of the present invention, not only a drive motor 111, but also an inner housing comprising a crank mechanism housing 105 and a gear housing 107, and most components or elements of the power transmission mechanism 117 installed inside the crank housing 105 the connecting rod mechanism and the gear housing 107 are attached to or connected to the outer housing 103. Therefore, due to these elements, as well as due to the drive motor 111, the total mass of the outer casing 103 is further increased, which further improves the protection of the handle 109 from vibration.

Further, in this embodiment of the present invention, the rotary sleeve 151 is mounted so that it can move axially relative to the cylinder 131 and the third bevel gear 153 and rotate together with the cylinder 131 and the third bevel gear 153. Therefore, the rotary sleeve 151 can transmit torque from the second bevel gear 149 to the cylinder 131 and the third bevel gear 153 without being subjected to vibration occurring in the axial direction of the working element enta.

In addition, in this embodiment of the present invention, the torque of the drive motor 111 is distributed by the rotary sleeve 151 in the following directions: providing impact power to the working element 119 of the perforator and providing power to the rotation of the working element 119 of the perforator. Therefore, components related to power transfer between the rotary sleeve 151 and the drive gear 141, including the rotary sleeve 151, are used for both of these directions. As a result, it is possible to reasonably reduce the number of parts necessary for actuating the working element 119 of the punch.

Further, in this embodiment of the present invention, in order to actuate the motion conversion mechanism 113, the third and fourth bevel gears 153, 155, which are supported by bearings 167, 169 in the bearing housing 163, are connected so that they can move with by the motion converting mechanism 113 in the axial direction of the working element relative to the outer casing 103. Therefore, the relative position of the motion converting mechanism 113 and the third and fourth bevel gears 153, 155 is maintained I am unchanged, despite the vibration, which allows for a steady and smooth movement.

Hammering or hammering is performed by the punch working element 119 under conditions when the user holding the handle 109 applies pressure to the outer casing 103 in the axial direction of this element 119 and presses this element 119 against the workpiece. In this embodiment of the present invention, the holder 137 and the bearing housing 163 are mounted in the housing 105 of the crank mechanism on the front and rear bearings 161, 165, that is, they can only be moved in the axial direction of this housing 105. This design allows stable pressure conditions the working element 119 of the punch to the workpiece.

Second Embodiment

Now, with reference to FIGS. 4-10, a perforator 201 according to a second embodiment of the present invention will be described. An internal actuator designed to actuate the punch operating member 219 (a motion conversion mechanism 213 causing the punch operating member 219 to move with impact, and an impact mechanism (not shown)), and a power transmission mechanism 217 for transmitting torque to the punch work member 219 is essentially of the same construction as the first embodiment of the present invention described above. However, in this embodiment of the present invention, for convenience of explanation, FIG. 8 shows a portion of the motion conversion mechanism 213, and FIG. 7 shows a portion of the power transmission mechanism 217. The motion converting mechanism 213 is a component that corresponds to the “impact generating unit” in the terminology of the present invention.

As shown in FIGS. 4 and 5, the outer case 203 is integrally formed with the handle 209. The outer case 203 and the handle 209 are components that correspond to the “outer case” and the “handle” in the terminology of the present invention. As shown in FIGS. 4-6, in the outer casing 203 are the motor casing 208 in which the driving motor 211 is located, and the inner casing 205 in which the motion conversion mechanism 213, the percussion mechanism, and the power transmission mechanism 217 are located. The drive motor 211 is turned on when the user presses a switch 209a located on the handle 209. The drive motor 211 is mounted so that its axis of rotation extends in a vertical direction (vertical in FIG. 4), substantially perpendicular to the axial direction of the punch working member 219, while on the side of the end part (lower end part) of the drive motor, distant with respect to the axis of the working element 219 of the perforator, the motor housing 208 is attached to the outer casing at 203 so that it can rotate on shaft 281 in the direction of the operating element axis.

In the end part (rear), when viewed in the axial direction, the inner housing 205 is connected to the outer housing 203 through elastic rubber elements 283, 284 in the form of balls that protect against vibration (in this embodiment, two at the upper and lower edges), which allows this housing 205 to move in the axial direction of the working element 219 of the punch relative to the outer housing 203. The other end portion of the inner housing 205, when viewed in the axial direction, when installed in the outer housing 203 is a rubber ring 285, circular in cross section, this allows the housing 205 to move in the axial direction of the punch member 219 relative to the outer housing 203. More specifically, in this embodiment of the present invention, the inner housing 205 in which the motion conversion mechanism 213 and the shock mechanism, which are the vibration sources, and the mechanism 217 are located power transmission, is attached to the outer casing 203, made as a unit with the handle 209, through elastic rubber elements 283, 284 so that this casing 205 can move axially m direction of the working element relative to the outer casing 203. The elastic rubber elements 283, 284 are components that correspond to the "elastic element" in the terminology of the present invention.

Figure 9 shows two upper elastic rubber elements 283, and figure 10 shows two lower elastic rubber elements 284. As shown in the drawings, the upper and lower elastic rubber elements 283, 284 are located on the right and left sides of the axis of the working element 219 punch. The upper and lower resilient rubber elements 283, 284 are fixed between the generally hemispherical concave surface 286a of the outer support region 286 for the rubber element formed on the outer casing 203 and having the hemispherical concave surface 287a of the inner support region 287 for the rubber element created on the inner housing 205.

In this embodiment of the present invention, for coupling the outer and inner bodies 203, 205 through the upper and lower elastic rubber elements 283, 284, in the upper right and left parts, the contact surfaces of the outer and inner supporting regions 286, 287 for the rubber element are arranged against each other, have, in general, the shape of an inverted letter V, when viewed from the side of the handle 209, and in the lower right and left parts of the contact surfaces of the outer and inner support regions 286, 287 for the rubber element, which are located against each other, have, in general, the shape of the letter V when viewed from the side of the handle 209. More specifically, the contact surfaces of the outer and inner bearing regions 286, 287 for the rubber element, which are located opposite each other, extend parallel to the axial direction of the working element 119 punch and tilted at an angle of approximately 45 degrees to the horizontal and vertical, passing in a plane perpendicular to this axial direction. With this design, the axial direction of the elastic rubber elements 283, 284 is mainly affected by the shear force, and in the direction perpendicular to the axial direction, the compressive force mainly acts on these elastic rubber elements.

The rubber ring 285 is installed as a guide element that serves to set the direction of movement of the inner housing 205 relative to the outer housing 203 in the axial direction of the working element of the hammer drill. The rubber ring 285 is located in the annular space that is created between the outer surface of the inner casing 205 (the front surface of the outer collar 205a of the annular shape created on the outer surface of the inner casing 205) and the inner surface of the outer casing 203 (the inner surface of the annular collar 203a created on the inner the surface of the outer casing 203). As a result, the rubber ring 285 prevents the inner casing 205 from unnecessarily moving in the direction transverse to the axial direction of the punch working element relative to the outer casing 203. Thus, when performing the chiselling or hammer drilling operation, when the punch working element 219 is pressed against the workpiece, you can prevent unnecessary movement of the working element 219 of the punch in the direction transverse to the axial direction of this working element, relative to the outer casing 203, which allows To perform this operation under stable conditions.

As shown in FIG. 6, the output shaft 212 of the drive motor 211 extends into the inner housing 205, and a driving gear 241 is formed at the far end of the output shaft 212, whereby the motion converting mechanism 213 is driven by a driven gear 242 coupled to the drive gear 241. The driven gear 242 is a component that corresponds to a “gear” in the terminology of the present invention. FIG. 8 shows a crank shaft 221 on which a driven gear 242, a crank disk 223, a spike 225, and a connecting rod 227 of the motion converting mechanism 213 are mounted.

7 shows a torque limiter 243, an intermediate shaft 245, and a first bevel gear 247 of the power transmission mechanism 217. In this embodiment, the torque limiter 243 is driven by the driven gear 242, and the torque is transmitted from the first bevel gear 247 to a holder (not shown) directly or through a second bevel gear (not shown) and a cylinder (not shown) )

The motor housing 208, in which the driving motor 211 is located, rotates on the shaft 281 in the direction along the axis of the working element when the inner housing 205 and the outer housing 203 are moved in the axial direction of this element relative to each other. To correspond to such a rotation, the output shaft 212 of the drive motor 211 is divided in its axial direction into the shaft body 212a and the upper shaft part 212b, on which the driving gear 241 is made. The axial hole 291 is made in a hexagonal shape at the end of the body 212a, and in the upper part 212b created a spherical element 292 having a hexagonal cross section. The spherical element 292 is installed in the hole 291 of a hexagonal shape so that it can move relative to the hole in the direction along its axis (in the axial direction of the shaft). As a result, the shaft body 212a and the upper shaft part 212b are articulated so that torque can be transmitted between them and they can be bent at the joint. The hexagonal hole 291 and the spherical element 292 form a “universal joint” according to the terminology of this invention. In addition, axially end regions of the upper portion 212b are rotatably mounted on bearings in the inner housing 205.

Further, the shaft body 212a is mounted in the inner housing 205 on the spherical bearing 295 so that it can move in all directions relative to this inner housing. The spherical bearing 295 includes a spherical concave portion 293, which is attached to the inner housing 205, and a spherical element 294, which is placed in the spherical concave portion 293. The spherical element 294 is mounted on the outer surface of the end region of the shaft body 212a so that it can slide in axial shaft direction. 5, the inner housing 205 is shown moving backward (in the direction of the handle 209) in the axial direction of the perforator working element relative to the outer housing 203, as a result of which the drive motor 211 is rotated backward and the output shaft 212 is bent, generally taking a broken shape.

In addition, the areas of the engine housing 208 and the inner housing 205, which include the junction of the body 212a and the shaft upper portion 212b, are covered by a flexible (rubber) dust cover 297.

The hammer drill 201 corresponding to this embodiment of the present invention has the construction described above. Therefore, during operation, when the shock mechanism assembly is actuated, pulse and cyclic vibrations occur in the axial direction of the perforating tool 219 in the inner housing 205. However, the transmission of vibration from the inner housing 205 to the outer housing 203 and the handle 209 is reduced due to the elastic deformation of the elastic rubber elements 283, 284. Moreover, in this embodiment of the present invention, the drive motor 211 is mounted in the outer housing 203 so that it can rotate in the direction along the axis of the working element of the hammer drill. With this design, when the drive motor 211, as a component of a large mass, is attached to the outer casing 203, the mass of the handle 209, made integrally with the outer casing 203, can be made relatively large compared to the inner casing 205, in which the shock mechanism assembly is located , which improves the protection of the handle 209 from vibration.

Further, the elastic rubber elements 283, 284 have a shear stiffness lower than their compressive stiffness, or, in other words, vibration can be reduced more due to shear deformation than to compression deformation. In this embodiment of the present invention, in order to use this property, it is made so that the elastic rubber elements 283, 284 undergo shear deformation in the axial direction of the punch working element. With this design, it is possible to enhance the effect of reducing the vibration of the handle 209 due to shear deformation occurring in the elastic rubber elements 283, 284.

In addition, the elastic rubber elements 283, 284 undergo compression deformations in the horizontal direction and the vertical direction transverse to the axial direction of the punch working element 219. With this design, it is possible to prevent unnecessary movement of the outer casing 203 and the inner casing 205 relative to each other in the horizontal direction and the vertical direction, which ensures stable conditions for the working element 219 of the punch to be pressed against the workpiece.

Further, in this embodiment of the present invention, the drive gear 241 and the driven gear 242 that drive the motion converting mechanism 213 are located in the inner housing 205 and are fixed to the outer housing 203 together with the motion converting mechanism 213 so that they can move in the axial direction of the working element of the perforator relative to the outer casing 203. Therefore, the relative position of the movement conversion mechanism 213, the driving gear 241 and the driven gear th wheel 242 remains unchanged, despite the vibration, which allows for stable and smooth movement.

For the second embodiment of the present invention, it is indicated that the elastic rubber elements 283, 284 are spherical, but they can also be cylindrical. Further, it is indicated that the joint point of the divided output shaft 212 has such a structure that a hole 291 is formed in the shaft body 212a and a spherical element 292 is made in the upper part 212b of the shaft, having a hexagonal shape in cross section, but, moreover, can be swapped. The universal joint is not limited to a structure comprising a hole 291 of a hexagonal shape and a spherical element 292 having a hexagonal shape in cross section.

Further, in the above-described first and second embodiments of the present invention, a perforator is considered as a typical example of a percussion instrument, but the invention can also be applied to a jackhammer, in which the working element 119 or 219 is forced to perform axial movement only with impact.

In view of the above invention, the following aspects may be contemplated.

Aspect 1

"A percussion instrument according to any one of claims 1 to 3, comprising an inner case in which the impact generating unit is located, the inner case being attached to the outer case."

Aspect 2

"A percussion instrument in accordance with aspect 1, wherein the percussion generating unit is mounted in the inner housing on the front and rear sliding bearings and is slidable in the axial direction of the tool member relative to the inner housing."

Aspect 3

"The impact tool according to claim 3, further comprising an operation mode switching element, providing switching between the jackhammer mode, in which the working element only moves with the blow, and the punch mode, in which the working element moves with the blow and rotation, and the element the power transmission also serves as a coupling member for switching an operation mode that transmits electric motor torque to the operating element when the operating mode switching element is not Ebed in punch mode, and interrupts the transmission of torque when operating mode switching element transferred to the hammer mode. "

Aspect 4

"A percussion instrument according to any one of claims 1 to 6, comprising a motion conversion mechanism that converts rotational motion to translational, and an impact element that performs translational movement under the control of the motion conversion mechanism and creates an impact force acting on the tool working element."

Aspect 5

"The impact tool according to any one of claims 4 to 6, in which the elastic element comprises an elastic rubber element, and the elastic element is mainly subjected to shear deformation in the axial direction of the working element and mainly to compression deformation in the direction transverse to the axial direction punch tool ".

Aspect 6

"The impact tool according to claim 6, in which the universal joint designed to articulate the parts of the divided shaft, contains a hexagonal hole created in one of the parts of the divided shaft, and a spherical element having a hexagonal cross section created in another part of the divided shaft and mounted in a hexagonal hole. "

Reference designations

101 - Hammer (Impact Tool)

103 - External housing

105 - Crankcase housing

106 - Glass

106a - Inner flange

107 - Gear housing

109 - Handle

109a - Switch

111 - Drive Electric Motor (Electric Motor)

112 - Output shaft

113 - Movement Conversion Mechanism (Impact Creation Node)

115 - Impact mechanism

117 - Power transmission mechanism

119 - The working element of the punch (Working element of the tool)

121 - Crank shaft

123 - Crank Disc

125 - Thorn

127 - Connecting Rod

128 - Finger

129 - Piston

131 - Cylinder

131a - Air chamber

131b - Clutch Teeth

132 - Connecting pin

133 - Striker

135 - Adapter

137 - Holder

137a - Rear flange

141 - Drive gear

143 - Torque limiter

143a - Spring

145 - Intermediate shaft

147 - First bevel gear

149 - The second bevel gear (Gear wheel actuating the working element)

151 - Rotating sleeve (torque transmission element)

151a - Clutch Teeth

151b - Ring Groove

153 - Third Bevel Gear (Power Transmission Gear)

155 - Fourth Bevel Gear (Gear)

161 - Front plain bearing

163 - Bearing housing

165 - Rear plain bearing

167 - Rolling bearing

169 - plain bearing

171 - Compression Helical Spring (Resilient member)

173 - Rubber ring

175 - Rotary mode switch (Element of the change of operating mode)

175a - Eccentric

201 - Rotary Hammer (Impact Tool)

203 - External housing

203a - Inner flange

205 - Inner housing

205a - External flange

208 - Motor housing

209 - Handle

209a - Switch

211 - Drive Electric Motor (Electric Motor)

212 - Output shaft

212a - shaft body

212b - The upper part of the shaft

213 - Movement Conversion Mechanism (Impact Creation Node)

217 - Power Transmission Mechanism

219 - The working element of the punch (Tool working element)

221 - Crank shaft

223 - Crank disc

225 - Thorn

227 - Connecting Rod

241 - Drive gear

242 - Driven gear

243 - Torque limiter

245 - Intermediate shaft

247 - The first bevel gear

281 - Val

283, 284 - Elastic rubber element (Elastic element)

285 - Rubber ring

286 - External support area for the rubber element

286a - Spherical concave surface

287 - Inner support area for the rubber element

287a - Spherical concave surface

291 - Hexagonal Hole

292 - Spherical element

293 - Spherical concave part

294 - Spherical element

295 - Spherical bearing

297 - Dust cover.

Claims (6)

1. Tool percussion, providing translational movement of the working element of the tool in the axial direction of this working element to perform a given operation, containing:
- handle held by the user;
- the outer casing, made as a unit with the handle;
- an electric motor located in the outer casing in such a way that its axis of rotation passes in the transverse direction relative to the axis of the working element of the tool;
- a gear driven into rotation by the received torque of the electric motor in the outer casing;
- a shock generating unit driven by a gear in the outer casing; and
- a percussion element driven by the impact creation unit and providing translational movement of the tool working element;
a torque transmission element, which is located on the side of the outer casing and rotates around the axis of the tool working element under the action of electric motor torque, and a power transmission gear, which rotates together with the torque transmission element and transmits torque to the gear, the transmission gear power made with the possibility of moving together with the site of the creation of the impact in the axial direction of the working element of the tool relative to the transmission element Omenta while being in grip with the gear;
wherein the electric motor is mounted on the outer casing, and the outer casing is connected to the impact generating unit and the gear via an elastic element and is arranged to move in the axial direction of the tool working element relative to the impact generating unit and the gear. 2. The percussion instrument according to claim 1, in which the electric motor is fixedly mounted in the outer casing and is made as a unit with the handle. 3. The impact tool according to claim 1, further comprising a gear wheel for actuating the working element, which causes the tool element to rotate in a circumferential direction under the action of electric motor torque, wherein the power transmission gear is rotated by the actuating gear working element through a torque transmission element. 4. The tool percussion, providing translational movement of the working element of the tool in the axial direction of this working element to perform a given operation, containing:
- handle held by the user;
- the outer casing, made as a unit with the handle;
- an electric motor located in the outer casing in such a way that its axis of rotation passes in the transverse direction relative to the axis of the working element of the tool;
- a gear driven into rotation by the received torque of the electric motor in the outer casing;
- a shock generating unit driven by a gear in the outer casing; and
- a percussion element driven by the impact creation unit and providing translational movement of the tool working element;
wherein the electric motor is mounted on the outer casing, and the outer casing is connected to the impact generating unit and the gear via an elastic element and is arranged to move in the axial direction of the tool working element relative to the impact generating unit and the gear;
moreover, the end part of the electric motor, distant with respect to the axis of the working element of the tool in the direction along the axis of rotation of the electric motor, is mounted on the outer casing so that the electric motor can rotate in the direction along the axis of the working element. 5. The impact tool according to claim 4, in which the output shaft of the electric motor is divided in the axial direction of this shaft and parts of the divided shaft are jointed using a universal joint. 6. The impact tool according to claim 5, containing a dust cover that closes at least the universal hinge.

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